- The RX100 is scarcely any worse than m43. The same pixel density, with the same per-pixel noise, but scaled up to a 36Mp m43 sensor would mean equivalent enlargements would show notably less noise than today's m43 sensors.

Interesting Paul. If what you say would translate into say a 30Mp sensor with less noise than todays sensor then that sounds like the way to go. If it mean's even slightly more noise though then it would be a disaster in sales/marketing terms. I suspect the slower development in m4/3s sensors probably has a lot to do with the fact that Sony doesn't use that size.